外观设计模式
外观设计模式向复杂的子系统提供了简单的接口,相比将一系列的类和他们的接口暴露给用户,你只需要暴露一些简单的未定义的API。
接下来的图片解释了这一概念。
安康;(NSArray *) getAlbums;,,
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安康;(空白)addAlbum:(Album *) Album atIndex: (int)指数;,,
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安康;(void) deleteAlbumAtIndex: (int)指数;
LiabraryAPI。米文件。加入
# import “HTTPClient.h”,,
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# import “PersistencyManager。h”
@interfaceLibraryAPI (),,
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{,,
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,,,HTTPClient *客户,,,
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,,,PersistencyManager *经理,,,
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,,,BOOL isOnLine;,,
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}
LiabraryAPI。米文件中添加下面代码:
- - - - - - (id) init ,
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{,,
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,,,if (=self [superinit]), {,,
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,,,,,,,client =, [[HTTPClientalloc] init];,,
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,,,,,,,manager =, [[PersistencyManageralloc], init];,,
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,,,,,,,isOnLine =,不,,,
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,,,},,
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,,,returnself;,,
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}
- (NSArray *) getAlbums ,
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{,,
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,,,return [managergetAlbums];,,
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},,
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,安康;addAlbum(空白):(Album *) Album atIndex: (int) index ,
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{,,
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,,,(manageraddAlbum: album atIndex:指数),,,
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,,,if (isOnLine), {,,
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,,,,,,,,,,,,,,,(clientpostRequest: @“/api/addAlbum”身体:[album 描述]];,,
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,,,},,
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},,
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(空白)saveAlbums 作用;
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{,,
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,,,(managersaveAlbums);,,
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},,
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安康;(void) deleteAlbumAtIndex: (int) index ,
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{,,
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,,,(managerdeleteAlbumAtIndex:指数),,,
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,,,if (isOnLine), {,,
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,,,,,,,(clientpostRequest: @“/api/deleteAlbum”身体:[@(指数),描述]];,,
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,,,},,
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}
,
安康;addAlbum(空白):(Album *) Album atIndex: (int)指数
